Improved hydraulic press



@met i dicessi J. B. T UNSTALL, OF BOKYD'ION, VIRGINIA.

Lemrspaamlvo. 83,424, dated october 27, 186s.

nvrrnovnn HYDRAULIC PRESS.

Toall whom it may concern:

Be it known that I, J. B. TUNSTALL, near Boydton, in the county of Mecklenburg, and State of Virginia, have` invented certain new and useful Improvements in Hydraulic Presses; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and tothe-letters of reference marked thereon, which form a part of thisspeciiication, in which- Figure yl represents a vertical section of my improved hydraulic press, and i Figure 2, a side elevation of the same.

The object of my invention is to provide a conven, ient and simple hydraulic press, which shall be adaptable both to purposes of compressing various articles, and the elevating of weights; and to this end my improvement consists in providing the cylinder of the press with a cross-head, and suitably connecting with the same pivoted levers, Which'have upon their opposite ends toothed segments for working the platen of the pressing-device and the shaft of the weight-clef vator. i

In the accompanying drawings, which show a convenient arrangement of parts vfor carrying out the ob jects of my invention, A represents the frame of the machine, the lower part of which serves as a tank for `containing the water used in its operation. A verti--` calcylinder, B, providedwith a suitablypacked piston, is secured to the frameA, and has in communication withit a force-pump, b, operated by the lever b2. The power ofthe machine can be proportionally increased by increasing the diameter 'of B relatively to b. The piston of the cylinder B is provided with piston-rods b b, to the upper ends of which a cross-head, D, is secured. The piston-rods b b move in guides in a sup- V plementary frame, C, which is secured upon the top ofthe cylinder B, and held by the bolts c c.

The levers E E are connected by links to the crosshead D, and have toothed segments upon their opposite' ends. These levers are pivoted to the supplementarv frame O, the relative lengths of their arms being proportioned according to the amount of pressure to be exerted..

A shaft, F, is mounted in bearings in the frame A, and has upon itv a pinion, f', which gears with the toothed segment upon the lever E', and is likewise vprovided with a pulley,f, to` which a cord for elevating weights is attached.

i A frame or press-head, G, moves vertically in guides in the frame A, and has secured to it a rack, g, with which the toothed segment on the end of .the lever E gears; `The weight of the pressfhead is colmterbalanced by weights g', attached to cords passing over pulleys on the main frame.` Platens of proper size and form can be attached to the press-head for the purpose of suitably effecting desired compression.

A single lever may be used for both pressing and elevating, when preferred, by having a number of holes therein, so as to vary the position of the fulcrum to suit the requirements of the work.

When the water from the tank is forced into the cylinder B' by the force-pump b, it presses upon the piston thereof, and causes it to ascend, the pressure being as much greater than that applied to b as the area of the cylinder-piston exceeds that of the pump. The cross-head D, in its ascent, draws up the inner ends of the levers E E', consequently forcing down the press-head and rotating the elevating-shaft. The cylinder B is to be provided with a suitable cock orvalve for allowing the water to escape when the pressure is to be taken off. i

It will be seen thatl power can be gained proportionally by increasing the lengths of the inner arms of the levers E E, and platens suitable to diiierent kinds of work can be attached to the press-head Gr, according y to convenience.

I do not broadly claim the several devices which go tomake up the machine above described, either separately or in combination, for them I know to be old; but

What I do claim, and desire to secure by Letters Patent, is

The arrangement, herein described,`of cross-head D, attached to levers vlil E', by link-connection x, segment-gearing o o, rack-g, press-head G, shaft F, pulley f, with its cord and weight, all constructed and operated as set forth.

In testimony that I claim the foregoing as my own, I afhx my signature in presence of two witnesses.

Witnesses: J. B. TUNS'IALL.

J No. C. MANNDIG, f WM. O. YANcY. 

